Phosphorus-Bearing Combustion Environment

Based upon field tests performed in the combustion chamber of a fluid bed dryer used to dry sodium tripolyphosphate compounds, HAYNES® 556® alloy exhibits very good resistance to corrosion caused by formation of low-melting point eutectics involving phosphorus. Samples were exposed 30 days at a temperature of about 1475°F (800°C).

Alloy

Maximum Metal Affected

-

mils

µm

X

3.0

75

556®

6.0

150

214®

8.0

205

S

9.0

230

188

9.0

230

800H

11.0

280

304 SS

15.0

380

Molten Zinc

Resistance to molten zinc is an important consideration for structural components in galvanizing operations. Laboratory tests were performed at 850°F (455°C) for 50 hours in molten zinc to determine suitability for such operations. Results are given below: